Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
All we need to do is change the map region on your garminm so it includes Texas in the region you select... you will need to connect it to a computer to do this, and use the garmin express software.
Here are the steps to follow from within garmin express
If you have any further questions or need further help, let me know.
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.